Indication of Electron Neutrino Appearance from an Accelerator-Produced Off-Axis Muon Neutrino Beam

The NOvA experiment is a long-baseline accelerator-based neutrino oscillation experiment. It uses the upgraded NuMI beam from Fermilab to measure electron-neutrino appearance and muon-neutrino disappearance between the Near Detector, located at Fermilab, and the Far Detector, located at Ash River, Minnesota. The NuMI beam has recently reached and surpassed the 700 kW power benchmark. NOvA’s primary physics goals include precision measurements of oscillation parameters, such as [Formula: see text] and the atmospheric mass-squared splitting, along with probes of the mass hierarchy and of the CP violating phase. This talk will present the latest NOvA results, based on a neutrino beam exposure equivalent to [Formula: see text] protons-on-target.

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T2K and Beyond

Advances in High Energy Physics ◽

10.1155/2016/5496103 ◽

2016 ◽

Vol 2016 ◽

pp. 1-17

Author(s):

M. G. Catanesi

Keyword(s):

State Of The Art ◽

New Physics ◽

Electron Neutrino ◽

Muon Neutrino ◽

Precision Measurements ◽

Neutrino Beam ◽

Mixing Angle ◽

Long Baseline ◽

Physics Potential ◽

Electron Neutrino Appearance

This paper presents thestate of the artof the T2K experiment and the measurements prospects for the incoming years. After a brief description of the experiment, the most recent results will be illustrated. The observation of the electron neutrino appearance in a muon neutrino beam and the new high-precision measurements of the mixing angleθ13by the reactor experiments have led to a reevaluation of the expected sensitivity to the oscillation parameters, relative to what was given in the original T2K proposal. For this reason the new physics potential of T2K for7.8×1021p.o.t. and for data exposure 3 times larger than that expected to be reachable with accelerator and beam line upgrades in 2026 before the start of operation of the next generation of long-baseline neutrino oscillation experiments will also be described in the text. In particular the last challenging scenario opens the door to the possibility of obtaining, under some conditions, a 3σmeasurement excludingsin⁡(δCP)=0.

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Latest Results from the T2K Neutrino Experiment

Universe ◽

10.3390/universe5010021 ◽

2019 ◽

Vol 5 (1) ◽

pp. 21

Author(s):

Dean Karlen ◽

on behalf of the TtwoK Collaboration

Keyword(s):

Cp Violation ◽

Neutrino Oscillation ◽

Neutrino Mass ◽

Electron Neutrino ◽

Muon Neutrino ◽

Neutrino Experiment ◽

Long Baseline ◽

Neutrino Oscillation Experiment ◽

Electron Neutrino Appearance ◽

Oscillation Experiment

The T2K long baseline neutrino oscillation experiment measures muon neutrino disappearance and electron neutrino appearance in accelerator-produced neutrino and anti-neutrino beams. This presentation reports on the analysis of our data from an exposure of 2 . 6 × 10 21 protons on target. Results for oscillation parameters, including the CP violation parameter and neutrino mass ordering, are shown.

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Search for Muon-Neutrino to Electron-Neutrino Transitions in MINOS

Physical Review Letters ◽

10.1103/physrevlett.103.261802 ◽

2009 ◽

Vol 103 (26) ◽

Cited By ~ 42

Author(s):

P. Adamson ◽

C. Andreopoulos ◽

K. E. Arms ◽

R. Armstrong ◽

D. J. Auty ◽

...

Keyword(s):

Electron Neutrino ◽

Muon Neutrino

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THE PHANTOM OF THE OPERA: SUPERLUMINAL NEUTRINOS

Modern Physics Letters A ◽

10.1142/s0217732312300054 ◽

2012 ◽

Vol 27 (04) ◽

pp. 1230005 ◽

Cited By ~ 8

Author(s):

BO-QIANG MA

Keyword(s):

Field Theory ◽

Effective Field Theory ◽

Lorentz Violation ◽

Effective Field ◽

Electron Neutrino ◽

Muon Neutrino ◽

Experimental Measurements ◽

Background Fields

This is a brief review on the experimental measurements of the muon neutrino velocities from the OPERA, Fermilab and MINOS experiments and that of the (anti)-electron neutrino velocities from the supernova SN1987A, and consequently on the theoretical attempts to attribute the data as signals for superluminality of neutrinos. Different scenarios on how to understand and treat the background fields in the effective field theory frameworks are pointed out. Challenges on interpreting the OPERA result as a signal of neutrino superluminality are briefly reviewed and discussed. It is also pointed out that a covariant picture of Lorentz violation can avoid the refutation on the OPERA experiment.

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Measurement of the charged-current electron (anti-)neutrino inclusive cross-sections at the T2K off-axis near detector ND280

Journal of High Energy Physics ◽

10.1007/jhep10(2020)114 ◽

2020 ◽

Vol 2020 (10) ◽

Author(s):

K. Abe ◽

◽

N. Akhlaq ◽

R. Akutsu ◽

A. Ali ◽

...

Keyword(s):

Cross Sections ◽

Electron Neutrino ◽

Neutrino Beam ◽

Charged Current ◽

Total Cross Sections ◽

Neutrino Scattering ◽

Near Detector ◽

Current Electron ◽

Inclusive Electron ◽

Selection Of

Abstract The electron (anti-)neutrino component of the T2K neutrino beam constitutes the largest background in the measurement of electron (anti-)neutrino appearance at the far detector. The electron neutrino scattering is measured directly with the T2K off-axis near detector, ND280. The selection of the electron (anti-)neutrino events in the plastic scintillator target from both neutrino and anti-neutrino mode beams is discussed in this paper. The flux integrated single differential charged-current inclusive electron (anti-)neutrino cross-sections, dσ/dp and dσ/d cos(θ), and the total cross-sections in a limited phase-space in momentum and scattering angle (p > 300 MeV/c and θ ≤ 45°) are measured using a binned maximum likelihood fit and compared to the neutrino Monte Carlo generator predictions, resulting in good agreement.

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Parallel Event Selection on HPC Systems

EPJ Web of Conferences ◽

10.1051/epjconf/201921404059 ◽

2019 ◽

Vol 214 ◽

pp. 04059

Author(s):

Marc Paterno ◽

Jim Kowalkowski ◽

Saba Sehrish

Keyword(s):

Neutrino Oscillation ◽

Selection Criteria ◽

High Performance ◽

Electron Neutrino ◽

Recent Measurement ◽

Data Format ◽

Event Selection ◽

Full Dataset ◽

Table Data ◽

Electron Neutrino Appearance

In their recent measurement of the neutrino oscillation parameters, NOvA uses a sample of approximately 25 million reconstructed spills to search for electron-neutrino appearance events. These events are stored in an n-tuple format, in 250 thousand ROOT files. File sizes range from a few hundred KiB to a few MiB; the full dataset is approximately 1.4 TiB. These millions of events are reduced to a few tens of events by the application of strict event selection criteria, and then summarized by a handful of numbers each, which are used in the extraction of the neutrino oscillation parameters. The NOvA event selection code is currently a serial C++ program that reads these n-tuples. The current table data format and organization and the selection/ reduction processing involved provides us with an opportunity to explore alternate approaches to represent the data and implement the processing. We represent our n-tuple data in HDF5 format that is optimized for the HPC environment and which allows us to use the machine’s high-performance parallel I/O capabilities. We use MPI, numpy and h5py to implement our approach and compare the performance with the existing approach. We study the performance implications of using thousands of small files of different sizes as compared with one large file using HPC resources. This work has been done as part of the SciDAC project, “HEP analytics on HPC” in collaboration with the ASCR teams at ANL and LBNL.

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Measurement of the intrinsic electron neutrino component in the T2K neutrino beam with the ND280 detector

Physical Review D ◽

10.1103/physrevd.89.092003 ◽

2014 ◽

Vol 89 (9) ◽

Cited By ~ 20

Author(s):

K. Abe ◽

J. Adam ◽

H. Aihara ◽

T. Akiri ◽

C. Andreopoulos ◽

...

Keyword(s):

Electron Neutrino ◽

Neutrino Beam

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